window.onload = function(){
	var wrap = document.getElementById("wrap");
	var aList = wrap.getElementsByTagName("a");
	// console.log(a);
	for(var i = 0; i < aList.length; i++){
		aList[i].onmouseenter = function(){            //用onmouseenter而不是onmouseover防止冒泡造成不停运动
			var _this = this.getElementsByTagName("i")[0];
			// console.log(_this);
			startMove(_this,{top :-30,opacity :0},function(){
				_this.style.top = 30 + "px";
				startMove(_this,{top :8,opacity :100});
			});
		}
	}
}